如何要使通知消息，必须要用到两个类：NotificationManager和Notification，其他NotificationManager的初始化是用getSystemService方法，并且通过notify方法来向android系统发送消息栏通知和显示。
效果：
代码：
//消息通知栏
//定义NotificationManager
String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
//定义通知栏展现的内容信息
int icon = R.drawable.icon;
CharSequence tickerText = "我的通知栏标题";
long when = System.currentTimeMillis();
Notification notification = new Notification(icon, tickerText, when);
//定义下拉通知栏时要展现的内容信息
Context context = getApplicationContext();
CharSequence contentTitle = "我的通知栏标展开标题";
CharSequence contentText = "我的通知栏展开详细内容";
Intent notificationIntent = new Intent(this, BootStartDemo.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,notificationIntent, 0);
notification.setLatestEventInfo(context, contentTitle, contentText,contentIntent);
//用mNotificationManager的notify方法通知用户生成标题栏消息通知
mNotificationManager.notify(1, notification);
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